Electromagnetic regulating device.



e. HONOLD. ELECTROMAGNETIC REGULATING DEVICE.

APR. 2, 191 5.

APPL

- Patenied May 23, 1916.

UNITED STATES PATENT curios.

GOTTLOB HONOLD, 0F STUTTGART, GERMANY. ASSIGNOR TO THE FIR-M 0]? ROBERT BOSCH, OF STUTTGART, GERMANY.

ELEOROMAGNETIC REGULATING DEVICE.

Specification of Letters Patent.

Patented May 23, 1916.

Application filed April 2, 1915. Serial No. 18.742.

y do hereby declare the following to be a full,

clear, and exact description of'the invention,

such as will enable others skilled in the art to which it appertains, to make and use the same.

My co-pending application Serial No. 800,765, filed November 13, 1913, discloses in several embodiments, resistance regulating devices, having a mass of finely divided resistance material separated by non-con- I ducting partitions into variously arranged columns extending along the line. of pressure of the pressure member, the idea being to maintain an even distribution of the mass in spite of its tendency to pile up or accumulate at cliflerent places as a result of shock or of the regulating movement of the pressure member. The present invention represents improvements in the prior arrangements in that the finely divided resistance material at the very top of the mass is also maintained evenly distributed under the same conditions, the result being that the regulating effect is more regular and efiective. I attain this result in the present invention by providing a network of elastic material extending through the resistance mass, and having the capacity for expansion and retraction in response to the movements of a pressure member, such as the armature of an electromagnet. Preferably I provide a plurality of networks of elastic and nonconducting material of thread form, such as threads of wool or like material, and I extend the threads in parallel, divergent or intersecting lines in parallel planes substantially at right angles to the line of pressure of the pressure member, the crossing points of the threads in the various planes being in alinement or otherwise as desired. The movement of 'the threads in the finely divided resistance mass is effective to maintain an even distribution thereof notwithstanding its tendency to pile up irregularly.

In the accompanying drawings, illustrating a resistance regulating device of this kind, having an electromagnet and three networks as an example, Figure 1 shows a' section of the resistance mass and its container, with theelectromagnet shown diagrammatically in elevation; and Figs. 2, 3, 4: and 5 are perspective views of networks in various arrangements.

The resistance regulating device has a winding D of an electromagnet excited from a circuit to be regulated, and itnlso has an armature A responsive to the electromagnet against the stress of a spring. The metal container E is lined along its inner wall with a sleeve B of insulating material, and it holds the finely divided resistance material R of suitable character, such as carbon or carbon mixed with non-conducting material as mica. T he wool threads C are strung through and around the sleeve D and extend through the mass R in parallel planes substantially at right angles to the line of pressure of the armature-A. In Fig. 2, the designs of the outermost networks are alike, while the intermediate network is formed by diametrically disposed threads. In Fig. 3 the threads of the outermost networks form squares, while the threads of the intermediate network extend diagonally thereof. In Fig. t each of the outermost networks is made up of parallel extending threads at right angles to those of the other network, while the threads of the intermediate network form diamond shape figures. In Fig. 5 the threads of each of the networks form square meshes. It is obvious that the threads may be arranged in various other ways in the networks.

By using networks formed of non-conducting material the electric current flows with substantially uniform density between the armature A and the bottom of the container E; the resistance of the mass varies as the pressure applied thereto by the armature changes as a result of variation of the excitation of the winding D. By using elastic material, the threads follow the movements of the armature and thereby move in the mass at numerous places, keeping the mass comparatively loose and evenly distributed throughout the container. In

this way the regulation efiected by the device is more regular and effective.

- Having thus described my invention,what- I claim is:

1. In a resistance regulating device, a container, a mass of finely divided resistance material in the container, a pressure member arranged to apply pressure to said mass, and means for maintaining even distribution of said mass comprising a plurality of networks of elastic material of thread form ex tending in several planes through said mass.

2. In a resistance regulating device, a container, a mass of finely divided resistance -material 1n the container, a pressure member arranged to apply pressure to said mass,

and means for maintaining even distribu- "means for maintaining even distribution of said mass comprising a plurality of networks of elastic non-conducting material extending through said mass in planessubstantially at Copies or this patent may" be obtained for of said pressure member.

of thread form extending invarious directions through said mass in planes substantially at right angles to the line of pressure 6. In a resistance regulating device, a container, a mass of finely divided resistance material in the container, a pressure member arranged to apply pressure to said mass, and means for maintaining even distribution of said mass comprising a plurality of networks of W001 threads extending through said mass in various directions in planes substantially at right angles to the line of pressure of said pressure member.

In testimony whereof I affix my signature, in presence of two witnesses. .GOTTLOB HONOLD.

IVitnesses:

AnoLF Lnnrrnnn, PAUL VVoLroRr.

five cents each, by addressing the Commissioner 0! Iatcntl. Washington, D. C. 

